Stair.



A. E. RENDLE & J. T. NESDALL.

STAIR.

APPLICATION FILED MAB. 9, 1910.

Patented June 3, 1913.

2 8HEET8-SHEET 1.

' WITNESSES:

ATTORNEYS A. E. RENDLE & J. T. NESDALL.

STAIR.

APPLICATION FILED MAR. 9, 1910.

1,9635% 1 6., Patented June 3, 1913.

ATTORNEYS lllhllTETl' dTATEd PATENT ARTHUR E. RENDLE AND JOHN T. NESIDALL, OF NEW YORK, 'N. Y.; SAID NESDALT:

ASSIGNOR TO SAID RENDLE AND NEW YORK BRIDGE & IRON COMFANY, A COR- PORATION OF NEW YORK.

STAIR.

Specification of Letters Patent.

Patented. Jane 3,

\ Application filed March 9, 1910. Serial No. 548,206.

To all whom it may concern:

Be it known that We, ARTHUR E. Rename, a subject of the King of Great Britain, and JOHN T. NESDALL, a citizen of the United States, both residents of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Stair, of which the fol lowing is a full, clear, and exact description.

The invention is an improvement in stairs such as embody interlocking treads and risers, and ordinarily constructed of sheet metal and adapted to be erected as the building proceeds and avoid the necessity of temporary stair-Ways.

The invention has in view a stair of this character, in which the treads and risers are readily separable and assembled without the use of bolts, rivets or equivalent devices, and are held from pivoting on each other by their interlocking portions, the lat ter being in the nature of channels arranged in the face. of the trrad respectively at the foot of the riser and at or near the outer edge of the tread.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a vertical section of a stair constructed in accordance with our invention, the metallic risers and treads being shown to be covered over with risers and treads of marble or other suitable material; Fig. 2 is a cross-section through the stair on the line 22 of Fig. 1; Fig. 3 is a vtragmentary vertical section through the stair,

showing a modified form of the invention;

Fig. i is a similar section, showing another form of the invention; Fig. 5 is a similar section showing still another form of the invention; and Fig. (3 is a cross-section through one of the stringers.

In the construction of our improved stairway we preferably use stringers 10, as shown in Figs. 1 and 2; or 11, as shown in Fig. 6, the latter being ornamented and reinforced at the outer side by the ornamental :lllgit5-dl01lS1l at the top and bottom edges, and the intermediate molding 11 both the stringer 10 and the stringer 11 having inwardly-turned flanges 12 at the lower edge,

which in. F 2 is shown to be integrally formed, and in Fig. u in the nature of an angle-iron bolted or otherwise secured in place. In some cases it may be found preferable to use the ordinary commercial channel irons for the stringers. The steps of the stair comprise risers 13 and treads let, which are prefe'ably constructed of sheet metal, and, as shown in Figs. 1, 3, 4; and 5, are provided with interlocking channels 15 and 16 respectively, arranged in the face of the tread near its outer edge, these chan nels facing upwardly and of angular crosssection, whereby the risers and treads are prevented from pivoting on each other, the channel 15 of the riser preferably fitting Within the channel 16 of the tread, and in all of the forms of the invention shown, ex cept that in Fig. 3, the treads and risers are vertically separable. In Fig. 3, the channels 15 and 16 are shown to be of dovetailed form at one side, whereby it is necessary that they be assembled together by sliding one within the other from the end. The lower or inner portions of the risers and treads are likewise interlocked by channels 15 and 16 the channel 15 being formed at the foot of each riser and receiving the channel 16 of the tread. Thus, the risers and treads successively engage over each other in passing down the stair. The channcls 15 and 16 of the risers and treads in the modified form of the invention shown in Fig. 3, are dove-tailed at the inner side the same as the channels 15 and 16 of this form of the invention, and the channels 15 and 16" of the form of the invention shown in Fig. 4, although having vertical side walls similar to the channels 1.5 and 16 of this form of the invention, are beveled at the bottom to conform to and seat on the inwardly-turned supporting flanges 12 of the stringers.

In the form of the invention shown in Fig. 5, instead of the risers and troads l. eing provided with the channels, the user only has a relatively narrow channel 15 at its foot, in which is received and closely fits a downwardly turncl flange 16" at the inner edge of the tread.

In the form of the invention in Figs. 1 and 2, we have shown the stringers 1O p 1=o vided with angle-iron supports 17, on which the channels 16 of the treads seat, the channels 15 of the risers being similarly sup ported on clips or supports 18, bolted or otherwise secured to the flanges 12, the corresponding support 18, in the form of the invention illustrated in Fig. 3, being formed directly from the flanges 12 of the stringers by cutting the same therefrom and bending it horizontally. The angle irons 17 supporting the outer portions of the tread are ordinarily only used when the step is designed to carry a considerable load at one time, such, for example, as in school houses. In other cases, the supporting of the treads and risers at these points will ordinarily be suliicientlytaken care of by the interlocking of the channels, as shown in Figs. 3 and 4, this being the case by reason of the treads resting in the bases of therisers acting on the cantaliver principle actually supports the step.

In the form of the invention illustrated in Fig. 5, we have shown as a substitute for the angle-irons 17, a socket member 17, in which the channel 16 seats and is engaged at the opposite sides, not only supporting the tread at this point but also resisting any lateral strain brought on the tread or riser.

In the erection of the stair, the top riser is first placed in position and suitably secured, as, for example, by forming a groove in the floor to receive the channel 15; then the treads and risers are engaged in alternate order and in succession from this point downwardly, each tread as it is placed in position being adapted to support the work men in the engagement of the next tread below. With the metallic treads and risers assembled, the stair is adapted to be used as a temporary stairway during the erection of the building and before it is completed, the stair being afterward finished, as, for example, illustrated in Figs. 1, 3 and 5; in Fig. 1, the metallic risers and treads being respectively'covered by risers 20 and treads 21 respectively, of marble or other suitable material, the arrangement of .the channelsbeing such that they do not in any wise interfere with the risers 20 and treads 21 seating flat on the metal, and oii'ering a finished appearance.

In Fig. 3, we have shown the stair finished by covering the inner portions of the metallic treads with a checkered steel tread 22, and the outer portions with what is commonly known as a masons safety tread 23, the outer edge of the latter being supported by a suitable nosing 24 secured at the front of the riser.

In the form of the invention shown in Fig. 5, the metallic tread is shown to be covered with a cement tread or facing 25, the same being finished ofi' at the outer edge by a hooked-shaped metallic nosing '26, riveted or otherwise fastened to the riser, the free or hooked edge of the nosing being embedded in the cement.

Having thus described our invention, we claim as new and desire to secure by Letters Patent:

1. In a stair, a tread and a riser having interlocking channels separably connecting them.

2. In a stair, treads and risers having interlocking channels separably connecting them together, said channels formed in the top faces of the treads and respectively ar ranged at or near the outer edge of the tread and at the feet of the risers.

' 3. In a stair, treads and risers having interlccking channels detachably holding them the risers being 10- together, the channels of cated respectively at the head and foot thereof, and the channels of the treads arranged adjacent to their inner and outer edges and facing in the same direction, with the channel at the inner edge of each tread lit-tin within the channel at the foot cf each riser, and the channel at the head of each riser fitting within the channel at the outer edge of each tread.

a. In a stair, treads and risers having interlocking channels detachably connecting them together, with the channels opening upwardly to permit of the treads and risers being vertically separated in successive order.

5. In a stair, treads and risers having interlocking portions movable vertically into and out of engagement and permitting of the risers and treads being vertically separated in successive order, the saidinterlocking portions formed in the top faces of the treads. 6. In a stair, treads and risers having interlocking portions constructed to permit of the treads and risers being vertically separated in successive order, with the treads and risers successively engaging over each other in stair.

7. A stair comprising a series of treads.

and risers having interlocking channels detachably connectin them together, with each riser forming the uter portion of the tread above.

- 8. A metallic stair, including an interlocl c ing, self-supporting tread and riser, each of said elements comprising a body-portion and an angulated portion paralleling one face of the body-portion of the other element.

. 9. A metallic stair, including a positively interlocked tread and riser, each of said elements comprising a body-portion and a plurality of portions arranged at approximately right angles to its respective body-portion and paralleling the body-portion of the other element. l

- 10. A metallic stair including ariser provided with angulated portions at each edge,

and a tread similarly provided with angulated portions at each of its edges and lying approximately parallel with the angulated passing toward the bottom of the tions of said tread paralleling the body- 1,0e3,21e i: It

portions of the risers and interlocking there with, the angulated portion of the tread engaging the face of the riser.

11. A metallic stair, including a plurality of risers each comprising a body-portion and a plurality of angulated portions, and a tread also comprising a body-portion and a plurality of angulated portions one of which interlocks with the body-portion of one riser. and another interlocking with an angulatedportion of another riser.

12. A metallic stair, including a plurality of risers each comprising a body-portion and a plurality of angulated portions, and a tread also comprising a body-portion and a plurality of angulated portions one of which interlocks with the body-portion of one riser and another interlocking with an angulated portion of another riser, both angulated porportion of said riser.

13. A steel stair, including an interlocking, self-supporting tread and riser, and means engaging said tread and riser adjacent the point of their interlocking for sustaining said tread and riser in their interlocked position.

14. A metallic stair, including a positively interlocked tread and riser each of said elements comprising a body-portion and a plurality of portions arranged at an angle'to its respective body-portion and engaging and names to this specification in the presence of two subscribing witnesses.

ARTHUR E. RENDIZJEL JOHN T. NESDALL.

Witnesses:

GEORGE B. CARHART, ALBERT F. BLooD. 

